<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .page {
            display: flex;
            height: 100vh;
        }

        .menu {
            /* width: 200px; */
            flex: 0 0 200px;
            background-color: #ec9743;
        }

        .content {
            flex: 1;
            background-color: #7c5e5e;
        }
    </style>
</head>

<body>
    <div class="page">
        <div class="menu"></div>
        <div class="content"></div>
    </div>
</body>

</html>